netdev - Re: [PATCH net-next] net: ipv6: Add a sysctl to make optimistic addresses useful candidates

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Date:	Tue, 28 Oct 2014 17:59:06 +0900
From:	Erik Kline <ek@...gle.com>
To:	Lorenzo Colitti <lorenzo@...gle.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Ben Hutchings <ben@...adent.org.uk>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next] net: ipv6: Add a sysctl to make optimistic
 addresses useful candidates

>>          *      Configure the address for reception. Now it is valid.
>>          */
>>
>> -       ipv6_ifa_notify(RTM_NEWADDR, ifp);
>> +       /* If optimistic DAD is in use, the notification was already sent
>> +        * in addrconf_dad_begin().
>> +        */
>> +       if (!ipv6_use_optimistic_addr(ifp->idev))
>> +               ipv6_ifa_notify(RTM_NEWADDR, ifp);
>
> Won't this result in not sending RTM_NEWADDR messages if
> use_optimistic is enabled on the interface, but the IP address that
> has just completed DAD is not an optimistic address (e.g., if it's a
> manually-configured address)?

Gah, yes.  I originally unconditionally sent the RTM_NEWADDR, but
there was some concern about sending duplicates so this was a weak
attempt to reduce spurious messages.

I still think sending the RTM_NEWADDR unconditionally is the right
thing, since we send them all the time when something about the
address changes (including timer-refresh on receipt of RAs).

I'll revert that bit and send an updated patch ASAP.

Thanks.
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